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1.
$\frac{8}{12} = \frac{2}{3} \\ \\ \frac{22}{77} = \frac{2}{7} \\ \\$
2.
\frac{3}{4} = \frac{28}{36} > \frac{27}{36} " alt=" \frac{9}{17} < \frac{19}{34} = \frac{18}{34} < \frac{19}{34} \\ \\ \frac{7}{9} > \frac{3}{4} = \frac{28}{36} > \frac{27}{36} " align="absmiddle" class="latex-formula">

3.
$\frac{1}{5} + \frac{2}{7} = \frac{7 + 10}{35} = \frac{17}{35} \\ \\ \frac{11}{18} - \frac{5}{12 } = \frac{22 - 15}{36} = \frac{7}{36} \\ \\ 4 \frac{7}{12} + 1 \frac{3}{16} = \frac{55}{12} + \frac{19}{16} = \frac{220 + 57}{48} = \frac{277}{48} = 5 \frac{33}{48} = 5 \frac{11}{16} \\ \\ 8 \frac{17}{20} - 6 \frac{7}{10} = \frac{177}{20} - \frac{67}{10} = \frac{177 - 134}{20} = \frac{43}{20} = 2 \frac{3}{20}$
4.
$1). \: \: 5\frac{8}{10} - 2 \frac{1}{2} = \frac{58}{10} - \frac{5}{2} = \frac{58 - 25}{2} = \frac{23}{2} = 11.5 \\ \\ 2) . \: 11.5 + 5.8 = 17.3 \: kg$
ответ: 17,3

5.
$5 \frac{8}{21} - x = 2 \frac{9}{14} \\ \\ x = 5 \frac{8}{21} - 2 \frac{9}{14} \\ \\ x = \frac{113}{21} - \frac{37}{14} \\ \\ x = \frac{226 -111 }{42} \\ \\ x = \frac{115}{42} = 2 \frac{31}{42} \\ \\ \\$